What do you do if you are smart IQ wise but not smart in those things that help you do well at an interview?

I feel like questions like these are prefaced by the assumption that if you’re not able to interview well, then you’re unable to practice to be a good interviewer.

Nothing about the human condition is binary or 100% innate; anyone can change if they put in the effort, but the degree of effort is highly dictated by time and circumstance.

Bottom line: the degree with which you’re unable to to do well at an interview is proportional to how much you’re willing to put in the time and effort to practice being a good interviewer given your own circumstances, as well as how much you really want to be an actuary (or get whatever role). There is no easy path (for most).

"not smart in those things" <> "can't do reasonably well at those things given the right effort and practice".

Thread above talks what it takes to be good at interviewing. Applies to those who are naturals as well as to those who are naturally awful. Not sure there's such a thing as somebody who isn't capable of learning how to interview "well enough" to get a job. I have met some that choose not to do what it takes, for a variety of reasons.